注册代码一直提示输入字符串格式不正确解决方案

public int AddUInfo(string P_Str_Name, bool P_Bl_Sex, string P_Str_Password, string P_Str_TrueName, string P_Str_Questions, string P_Str_Answers, string P_Str_Phonecode, string P_Str_Emails, string P_Str_City, string P_Str_Address, string P_Str_PostCode)    {        SqlConnection myConn = dbObj.GetConnection();        SqlCommand myCmd = new SqlCommand("Proc_InsertUInfo", myConn);        myCmd.CommandType = CommandType.StoredProcedure;        //添加参数        SqlParameter Name = new SqlParameter("@Name", SqlDbType.VarChar, 50);        Name.Value = P_Str_Name;        myCmd.Parameters.Add(Name);        //添加参数        SqlParameter sex = new SqlParameter("@sex", SqlDbType.Bit,1);        sex.Value = P_Bl_Sex;        myCmd.Parameters.Add(sex);        //添加参数        SqlParameter Password = new SqlParameter("@Password", SqlDbType.VarChar, 50);        Password.Value = P_Str_Password;        myCmd.Parameters.Add(Password);        //添加参数        SqlParameter TrueName = new SqlParameter("@TrueName", SqlDbType.VarChar, 50);        TrueName.Value = P_Str_TrueName;        myCmd.Parameters.Add(TrueName);        //添加参数        SqlParameter Questions = new SqlParameter("@Questions", SqlDbType.VarChar, 50);        Questions.Value = P_Str_Questions;        myCmd.Parameters.Add(Questions);        //添加参数        SqlParameter Answers = new SqlParameter("@Answers", SqlDbType.VarChar, 50);        Answers.Value = P_Str_Answers;        myCmd.Parameters.Add(Answers);        //添加参数        SqlParameter Phonecode = new SqlParameter("@Phonecode", SqlDbType.VarChar, 20);        Phonecode.Value = P_Str_Phonecode;        myCmd.Parameters.Add(Phonecode);        //添加参数        SqlParameter Emails = new SqlParameter("@Emails", SqlDbType.VarChar, 50);        Emails.Value = P_Str_Emails;        myCmd.Parameters.Add(Emails);        //添加参数        SqlParameter City = new SqlParameter("@City", SqlDbType.VarChar, 50);        City.Value = P_Str_City;        myCmd.Parameters.Add(City);        //添加参数        SqlParameter Address = new SqlParameter("@Address", SqlDbType.VarChar, 200);        Address.Value = P_Str_Address;        myCmd.Parameters.Add(Address);        //添加参数        SqlParameter PostCode = new SqlParameter("@PostCode", SqlDbType.Char, 10);        PostCode.Value = P_Str_PostCode;        myCmd.Parameters.Add(PostCode);        //添加参数        SqlParameter MemberId = myCmd.Parameters.Add("@MemberId",SqlDbType.BigInt,8);        MemberId.Direction = ParameterDirection.Output;        //执行过程        myConn.Open();        try        {            myCmd.ExecuteNonQuery();        }        catch (Exception ex)        {            throw(ex);                   }        finally        {             myCmd.Dispose();             myConn.Close();        }        return Convert.ToInt32(MemberId.Value.ToString());//错误消息提示这行出错          }

public partial class 前台_Register : System.Web.UI.Page{    UserInfoClass ucObj = new UserInfoClass();    public static int G_Int_CustomerID;    protected void Page_Load(object sender, EventArgs e)    {    }    protected void btnSave_Click(object sender, EventArgs e)    {        if (txtPostCode.Text.Trim() == "" && txtPassword.Text.Trim() == "")        {            Response.Write("<script>alert('请输入完整信息！');location='javascript:history.go(-1)';</script>");        }        else        {            bool P_BI_Sex;            if (Convert.ToInt32(ddlSex.SelectedItem.Value.Trim() )== 1)            {                P_BI_Sex = true;            }            else             {                P_BI_Sex = false;            }            G_Int_CustomerID = ucObj.AddUserInfo(txtName.Text.Trim(), P_BI_Sex, txtPassword.Text.Trim(), txtTrueName.Text.Trim(), txtPhone.Text.Trim(), txtEmail.Text.Trim(), ddlCity.SelectedItem.Text.Trim(), txtAddress.Text.Trim(), txtPostCode.Text.Trim());            Session["Username"] = "";            Session["Username"] = txtName.Text.Trim();            Response.Write("<script>alert('恭喜您，注册成功！');location='index.aspx'</script>");        }    }